Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 584 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
3. 3.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) switch off empty rooms (d) close the fridge quickly
7. 7.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
9. 9.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
16. 16.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
19. 19.True or false: to leave fridge door open saves electricity. (a) False (b) True
20. 20.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
23. 23.True or false: to leave the TV on standby saves electricity. (a) False (b) True
24. 24.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) set the AC to 24 °C
26. 26.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to use old filament bulbs saves electricity. (a) True (b) False
28. 28.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open
30. 30.True or false: to close the fridge quickly saves electricity. (a) True (b) False
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
37. 37.True or false: to use LED lamps wastes electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) unplug idle chargers (d) switch off empty rooms
39. 39.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps

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